A) \[{{[Fe{{(CN)}_{6}}]}^{3-}},\,{{[Co{{(CN)}_{6}}]}^{3-}}\]
B) \[Cr{{O}_{2}}C{{l}_{2}},\,MnO_{4}^{-}\]
C) \[Ti{{O}_{3}},\,Mn{{O}_{2}}\]
D) \[{{[Co{{(CN)}_{6}}]}^{3-}},\,Mn{{O}_{3}}\]
Correct Answer: B
Solution :
| [b] The sum of oxidation states of all atoms in a compound is equal to zero and sum of oxidation states of all atoms in an ion is equal to charge on the ion. |
| (i) \[{{[Fe{{(CN)}_{6}}]}^{3-}},\,\] O.N. of \[Fe=+3,\] \[{{[CO{{(CN)}_{6}}]}^{3-}},\] O.N. of \[Co=+3\] |
| (ii) \[Cr{{O}_{2}}C{{l}_{2}},\] O.N. of \[Cr=+\,6,\]\[{{[Mn{{O}_{4}}]}^{-}},\] O.N. of \[Mn=+7\] |
| (iii) \[Ti{{O}_{3}},\,\] O.N. of \[Ti=+6,\] \[Mn{{O}_{2}},\] O.N. of \[Mn=+4\] |
| (iv) \[{{[Co{{(CN)}_{6}}]}^{3+}},\] O.N. of \[Co=+3,\]\[Mn{{O}_{3}},\]O.N. of \[Mn=+6\]. |
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